Process for reducing flue-dust and other metal fines.



S. L. BOGGS.

PROCESS FOR REDUCING FLUE ousr AND OTHER'ME'TAL FINES. APPLIQAIION map APRLQ. 1914..

1,190,712. Patented July 11, 1 1

WMIYEN frventor= To all whom it may) concern:

warren snares PATENT SAMUEL L. BOGGS, OF PITTSBURGH, PENNSYLVANIA.

PROCESS FOR REDUCING F L U 'E-DUST AND GTHER METAL FINES.

ma aria.

Be it known that L' San sr. Bones, a resident of Pittshurgh, in the county of Al le heny and State of Pennsylvania. and a citizen of the UnitedStatesglnwe invented. certain new and useful Improyements'nn Processes for Reducing Flue Dust and other Metal Fines,- of which the following is l1.

specification.

-My invention r lates to reduction of what are ordinarily wasteproducts incident to reclucmg ores and refining metals and my' particular object is to furnish a process by means of which such waste products as fluedust for example. may be gathered as at comes fromf'the furnace, and may be reduced by means of the molten metal lIlGldent to reduction in the main furnacefand a blast furnished by gas generated in the furnace.

My invention ing the mixture to pour from someheight into a receptacle, andthen of applying to the'surtace of the'mixture in the receptacle a blast of thegas generated in themain fur- 'nace. ()f course fines which have been stored may be reduced by this same process,

and the gas may be otherwise. generated.

Tn the drawings I sh'owa convenient form of apparatus for practising my method.

Figure 1 is a diagrammatic elevation of (the ordinary combustion gases introduced thereto by pipe 12. The flue-dustincident to reduction in such furnaces is carried oll' by down-comer 13 and received IT! collcction 110x14. the outlet of which Is controlled by valve 15. The furnace spout lliemptics into a trough, or runner. 17. which is H!- clincd and adapted to empty the liquid metal flowing therethrough into the ladle car 18..

The pipe 19 controlled by valve 20, taps the supply line. ol excess gas generated in the furnace. By means of pivoted jointQl thcreis connected to this pipe a belhor lmrner, 22. The joint 21 is so arranged Specification ofLetters Patent. Appli cationfil ed spa; 991914. I Serial No. 350,755.

In this practice of my. process @thediurnaee 'strea-m pouring from the end ofthe itrough l I in theladleflS continues thisseparation; and" may be practised by mixing 'the fluealust or finefs'in the molten metal as it comes from the reduction furnace, allowwill float in the form of aainat bon-monoxid g; s taken from thebl nace itself.

ther stir the contents or the hall the hopper 30 the fines are collected. The

Patented Jrayii 91c.

that this burner may beraisedlolltjof the Way, or may be lowered so as to approl limately fit ov r the mouth otthe ladle car 18.

is tapped, moltenmetal flowsout helspout 1(3' and, down the trough 117. The gafte 1 ;5,; is

opened, allowing flue-dust. to faIlLu-ponthe 1 This 7 surface of the molten, metal rstreanrw falls into the ladle 18 and is m'ixeditheretlirouglnboth in itsttravel' fromvthe point nf combination and by means oftheuagi'tation caused by the pouring out at the end of the trough 17. Since the molten metale.comes from the furnace at a l'lQlt'WhlClLISRGQBSlClerablv above that necessary for 'reductipmiot metal lines, themixingof the meta li and lines. will of itself separate mostnot tern The subsequent a'gltatioiryand the gas blast efl'ects reduction. jl-l iveveml find that a certain percentageot therflue dustwill not be reduced by thism This gas is,1 in add'it v great heating powers peculiarlyeltectrve in reducing flue-dust and fines; "All. isjfo'rccd against the molten me it with sullicicnt Zl'OllCQ to agitate that this additional step greatly increases the ellicicncy olthe method of reduction which up to this point has'been partially disclosed in my Patent No. 1083724 January fitlnlfll t. In certain cases, depending on the character of the ores, it may be necessary to add a further reducing agent to the layer of dust on topiof the ladle. There- 1" ore I may spread a lightlzrvcr of coke dust over the top of the ladle before apl'ilying the blast. This aids inu'oduction, and tends to produce a metal sponge. even 'where the lines are not cntircly reduced to metal.

At a grcat many plants line-dust and other lincs have been simply dumped as a waste product...

In Fig. 3 T show apparatus designed for the practise ol myprocessindependently o'l' an actively operating blast furnace. In

i rided.

\Vhere the fines consist of metallic particles mixed with coke, ashes, etc, such metallie particles will be separated by their mingling with the molten metal, but where the fines have a. large proportion of metallic oxids, I find it necessary to add a. fiuxing agent, such as powdered limestone, or other available form of calcium. \Vhen this is done and the blast applied for a short time, the reduction will be practically complete.

The gneat'efiiciency, and the simplicity of reducing fluemlust just as it is made, Without storage, and by means of the coincident products of the blast furnace, that is molten metal and carbon andoxygen gas will be apparent to those familiar with this art.'

The further fact that this reduction may be done in the very ladle which is used for carrying off the molten metal adds to the value of my process.

Having thus described my invention and illustrated its use, I claim:

1. The process of reducing fiue-dust. or fines, consisting of emptying the dust into molten metal whereby the two are mingled,

and then applying a blast of the gas generated in the furnace to the surface of said mixture.

2. The process of reducing metal fines consisting of mixing the dust with molten metal, pouring the-mixture into a receptacle, applying a layer of coke braize to the top of said mixture, and then turning a blast upon the surface'of the latter mixture.

3. The process of reducing flue-dust or other fines of metal consisting of the successive steps of mixing the dust with flowing molten -metal, allowing the mixture to pour into a. receptacle, and applying a blast of carbon and oxygen gas from a blast furnace to reduce the fines.

4. The process of reducing flue-dust or other metal fines consisting of mixing said dust with molten metal as it is drawn from a blast furnace, allowing the mixture to pour into a receptacle, adding to the mixture :1 layer of coke braize, and applying thereto a blast of the gas generated in the furnace.

5. The process of collecting flue-dust of a blast furnace. emptying it into molten metal as it comes from the furnace, pouring the mixture into a receptacle, adding a layer of carbonaceous material to the mixture, and applying thereto a blast of the gas generated in the first reduction furnace.

6. The process of reducing ore dust by mixing it with molten metal and applying on top of the mixture a hot blast of reducing gas, substantially as described.

7. The process of reducing ore dust by mixing it with molten metal, adding a separate fluxing and reducing agent and applying a hot gas blast to the top of the mixture.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed Witnesses.

SAMUEL L. BOGGS. Witnesses Jo. BAILY Bnowx, Fnnnx STA'UB. 

